Replace the fixture or buy an appropriate switch and install it in the existing fixture.
If you're not comfortable finding and installing a switch, a new fixture is an easy swap and would likely look more finished/professional.
Happy Camping!
John.
Stock 2006 Dodge Ram 3500 MegaCab, 5.9L Cummins, Automatic, 2WD, Dually
- 30' 2006 Pilgrim Interntional travel trailer, dry weight ~7k pounds, GVWR ~9k pounds
- Husky weight distributing hitch, friction anti-sway control, electronic brake controller